Vegetable Kebabs

Name: Vegetable Kebabs
Ingredients: 1 1/4 teaspoons sugar; 1 cup olive oil; 1 large garlic clove, minced; 1 large red onion, cut into 1 1/2 inch pieces; 1 lb baby eggplant (about 4 inches long), cut crosswise into 3/4 inch thick slices; 1 lb small zucchini, cut crosswise into 3/4 inch thick slices; 1 tablespoon balsamic vinegar (preferably white); 1/2 cup white wine vinegar; 1/2 teaspoon salt; 1/4 teaspoon black pepper; 10 oz cremini mushrooms, trimmed; 18 (12 inch) metal or wooden skewers (soaked in warm water 30 minutes if wooden); 2 yellow bell peppers, cut into 1 1/2 inch pieces; 3/4 lb cherry tomatoes